A vision screening, as well as written and driving exams, may be necessary while applying for an Illinois driver's license. The IL DMV practice permit test is based on the contents of the Illinois Driver's Handbook. You are required to recognize traffic signs, signals, and pavement markings, as well as address questions about traffic laws, driving and safety rules, vehicle equipment, and crash avoidance. The Illinois DMV written test includes 35 questions, 15 of which are about traffic sign identification. A minimum of 28 questions must be answered correctly to pass the test. Let's start with our Illinois driving test now.